如何解决如何在GROUP BY和ORDER BY中使用多列但仅使用一列
我想显示联接表中的多列,但仅对group by
和order by
使用一列
我的PostgreSQL查询是这样的:
SELECT DISTINCT ON (r.id_rekrutmen)
r.id_rekrutmen,r.judul_rekrutmen,rw.tanggal_rekrutmen
FROM rekrutmen r
INNER JOIN rekrutmen_waktu rw
ON r.id_rekrutmen = rw.id_rekrutmen
ORDER BY r.id_rekrutmen,rw.tanggal_rekrutmen DESC;
解决方法
我想这就是你想要的:
SELECT
r.id_rekrutmen,r.judul_rekrutmen,MAX(rw.tanggal_rekrutmen) AS tanggal_rekrutmen
FROM rekrutmen r
INNER JOIN rekrutmen_waktu rw
ON r.id_rekrutmen = rw.id_rekrutmen
GROUP BY
r.id_rekrutmen,
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